 public class Circular { 

    Circle bottom;

    double height;

    void setBottom(Circle c) { 

       bottom = c;

    }

    void setHeight(double h) {

       height = h;

    }

    double getVolme() {

       if(bottom == null)

          return -1;

       else

          return bottom.getArea()*height/3.0;

    }

    double getBottomRadius() {

       return bottom.getRadius();

    }

    public void setBottomRadius(double r){

       bottom.setRadius(r);

    } 

}
